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Патент USA US2406134

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Aug. 20, 1946.
J. A. CAMERON
TOOL
GRINDING
MACHINE
Filed July 5, 1943
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15
2,406,134
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2 Sheets-Sheet. 1]
g
INVENTOR.
warp/1A 674M590”
Aug-20, 1946.
J. A. CAMERON
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2,406,134
TOOL GRINDING MACHINE
Filed July 5, 1943
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2 Sheets-Sheet 2
'16
17'
INVENTOR
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wasp/r ,4. 62/192790”
Patented Aug. 20, ‘1946
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2,406,134
STATES
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2,406,134
' PAT'EN
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"i‘bO’L GafNnING MACHINE .
Application
* Joseph A. Jilly
Cameron,
5, 1943;
Los‘Sea
Angeles;
No. ‘493,556
Calif. '- I; V
"
‘raisin.
(01. 51-161)
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This invention has to do with grinding Ina
chines, and more particularly with grinding ma~
chines for grinding surfaces which depart from
a circular cross section.
2
l
.
The various features and accomplishments as:
my invention, as well as other f'objects and rea
tur'es'wli'ich are preliminarily mentioned, will be
set forth in the following detailed description at‘
a ‘present preferred illustrative embodiment‘ of,
the invention, reference for this purpose being
;
Grinding machines of various designs for
grinding cylindrical surfaces are- in common use,
while other‘ known grinding machines are de
had to the accompanying drawings, in which: - V r
signed to grind solids of speci?c generation such
Fig. 1 is a fragmentary side elevational ‘View 'of
my grinding machine showing the workpiece be
as the surfaces of gear teeth or cam shapes. Such
machines, however, are limited to the con?gura
ing‘hel'd b'yaj'aw chuck;
tion of, the surface which may be ground,’ or
‘
,
. V;
_
Fig. 2 is a transverse sectional Viewthéréof
require major and time consuming changes to
taken through 2-2 of Fig. l;
_
‘
adapt them to the grinding of a di?erent surface.
Fig. 3 is a fragmentarysectional ‘View in plan.
It is a general object of the present invention
to provide a grinding machine which is capable 15 taken
Fig. along
4 is an
the 'enlarged‘sectionalview
line 3—3 of Fig. 1; I H e through
_ v
of grinding not only cylindrical surfaces but to
the workpiece and control cam receiving enjdgf.
grind a wide variety of eccentric and irregular
surfaces with a minimum of unproductive time
and effort in changing from one job to another.
It is another object of the invention to provide
a grinding machine which is capable of grinding
surfaces,’ the axes of which'are either parallel
tool‘ at an angle with the axis of the grinding
wheel.
the headstock spindle, showing a collet chuck
positioned thereon;
angular relationship of workpiece cam andigrind
wheel for grinding the clearance angle required
for a tap, end mill, router or the like;
a different position of the parts; ‘and
A further-object of my invention is to pro
ventional grinding machine, or as an independent
> _
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30
vide a grinding machine which is capable of both
internal and external grinding operations.’
A still further object of vmy invention is to
provide a grinding machine which is simple of
construction, economical of manufacture, durable
and‘e?icient in its action.
‘
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_
The grinding machine of the present invention
employs a control cam to effect a movement of
the rotating workpiece toward and from the
grinding wheel during the grinding operation.
By thisymeans, contours of various kinds may
easily be provided merely by choice or design of
L _
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n e I‘
Fig. ‘7 is another diagrammatic view _"showing
the angular relationship of the control _ camhca’m
follower, workpiece and grind wheel for grind
vide a grinding means which may be arranged
either as an attachmentror addition to a con
A still further object of my invention is to pro
_
Fig. 6 is a view similar to Fig. 5,. but showing
‘
grinding machine.
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‘Fig. 5 is a diagram'matical view showingthe
mg va square‘ opening in the workpiece.
The grinding machine ‘is mounted on a 'w'brk
bed'or bed frame I which may be of conventional
design and may be supported and arranged by
means not shown, but which may beof any con
ventional type, for movement both longitudinally
and transversely or merely longitudinally with
35
respect to a ‘grinding wheel G, and also for piv
otal movement on a vertical axis) with respect
to thegri'nding wheel. The grinding wheel‘ is
supported and driven in a suitable conventional
manner, not shown.
Thev grinding wheel_ nary
be so mounted as to move lengthwise of they bed’
frame or transversely thereto or inboth direc"-'_
tions much in the manner of the cross feed of
proper cams. Preferably, and in accordance
a lathe." Since supporting arrangements fenne
with a present illustrative embodiment of the
indicated relative ‘movements of" the 'work bed ‘I
invention; the control cam is secured to am 45 and grinding wheel G are well known in the ‘art,
tatabl‘e headstock spindle and the workpiece to
and may be of a conventional'n'aturel, no illust‘rae
be ground is secured in a suitable chuck of con
tion thereof is deemed necessary'in the‘ present
ventional design such as a three or four jaw
chuck or collet chuck of the type used in ‘engine
A_ headstock; base structure 2 is mounted on the
lathes. The control cam ‘and workpiece are then 60 work bed I. This base structure may be a mem
rotated at a suitable speed and the workpiece is
ber of inverted channel cross section and is se
caused to move laterally to and from the grind
cured nearione end to the midportion of the work
drawings;
ing wheel during the course of each revolution in
accordance with the con?guration of the control
cam.
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a
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Me
bed I by a pivot pin 3. The pivot pin may be
in the form of a bolt adapted, when loosened,- to
55 permit angular adjustment of the base structure
2,406,134
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ried thereby are moved laterally to and from the
grinding wheel G.
jwith respect to the bed frame I about a verti
ical axis; and, when tightened, to secure the base
structure 2 in its adjusted position. While a bolt
Sometimes it is desired to mount a relatively
long workpiece between the headstock spindle
lis-shown for simplicity,it is of course obvious
‘that more elaborate securing and adjusting
and a tailstock spindle and to move such work,
piece bodily to and from the grinding wheel.
jmeans may be provided to facilitate accurate’ an
‘gular adjustment ‘of the base structure 2.
The pivoted end of the base structure may be
"rounded and bear scale markings 4 which co-act
This is accomplished by means of an extension
29 of the rockable shaft 8 which is supported by
bracket bearing 30. Normally the extension 29
is in coaxial relation with the rockable shaft 8;
with a reference line'4a scribed on a contiguous
however, topermit pivotal ‘movement of the base
I complementary plate 5. Bracket bearings 6 and
frame 2 about the pivot pin 3, a universal joint 3|
‘ ‘I extend upwardly from the base structure 2 and
‘connects the rockable shaft 8 and its extension
: support a rockable shaft 8.
‘ ’
‘. 29. . Ifdesired, the two shafts may be merely
Journaled freely rotatable on the en d portion.
7
capable of disconnection ‘at this point for the tail
of the rockable shaft remote from the pivot pin
stock is not employed in conjunction with the
; 3 is a pulley unit 9 comprising aplurality of pul
' ‘headstockexcept when the two shafts 8 and 29
; ley wheels of di?erentdiameters which may also _. ,
are coaxial.
The extension 29 of the rockable shaft 8 has
‘1tatable
connected
on by
said
a belt
shaft
II to
8. aThe
corresponding
pulley .unitpulley
9 is; 20 secured thereon a tailstock arm 32 which care
ries a tailstock spindle 33 or other conventional
3 unit Ill mounted on a headstock spindle l2. The
work supporting tool or ?xture,
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. headstock spindle _|2 is supported above and par
Operation of my grinding machine isas fol
1 include a suitable drive pulley 9a also freely ro
‘ allel .to the rockable shaft 3 byra pair of head
lows:
.
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I'stock arms7 l3 and I4. The headstock arms are,
1. Grinding cylindrical objects.--The head'
?xedly secured at their lower ends to the rock 25' stock and tailstock spindles are disposed'in align
i able'shaft 8 and their upper ends form coaxial
ment; that is, the base structure 2. is in its “0”
. bearings |3a and Ma which receive and support '
crneutral straight line position.‘ A plain circu
‘ rotatablyvthe headstock spindle l2.
lar disc concentric with respect to the workpiece
The end of the headstock spindle l2 above the
is employed in place of the control cam It. The
‘ pivoted end of the base frame 2 is provided. with 30 workpiece is then rotated while the grinding
.a control cam collar |5_ which is adapted to carry .
wheel is moved into engagement with the work's
l the control cam I6. The control cam is in the 1 piece and either the grinding wheel or work bed
form of disc secured to collar I5 by screws |'|,'and
is moved longitudinally within the region of the
j the periphery of the cam is shaped to cause move
work to be ground. If the workpiece be long,
5 ment of the workpiece to and from the. grinding 35
it is supported between both the headstock and
, wheel during the course of revolution, as will be ,
tailstock spindles; otherwise it need be held only
The cam
. describedin more detail hereinafter.
by the headstock spindle.
1 may have any outline, depending upon the char- ‘
1 acteristics, desired to be given the workpiece. A
tain cutting tools or workpieces with a'clear
work holding devices such as a, jaw chuck 20
.
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mode of operation described above, with the ex- ,
ception that a cam |6 having a predetermined
ance angle appears in Figs.,6 and '7. .
the ?ange I5 is threaded as indicated at l9 (see i
‘ Figure 4) to accommodate various conventional
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surface to be ground is parallel to the axis of
rotation, the workpiece is mounted as in the ?rst
' cam outline speci?cally designed to grind cer
The headstock spindle l2 is provided with‘ a‘
I bore [8 therethrough, and its end portion beyond
_
2. Grinding noncylindrical objects.-—If the
variation in radius 'is substituted. For example,‘
in order to grind the lands 4| of a tap or an end
» mill 42, indicated diagrammatically in Figs’. 5
and 6, a controlcam l6 having a periphery of the
shown in Figdl, or a collet chuck2| as shown .
in Fig. 4. In the latter caseLthe collet chuck
receives collets 22 adapted to be tightened by a
suitable tension tube 23. Other work holding de
vices and jigs may of course be employed depend
ing upon the nature of the workpiece W (see Fig
general shape indicated at 43 'may be used. In
such operation the object is to give therlands
a, proper clearance angle. The portions 44- of
the cam, subtended by the same central angles
as the lands 4 I , are of gradually increasing radius
in the direction of rotation, the difference in radii
at the beginning and end points of said portions
ures 1, 5,6and7).
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being
of course equal to the depth to which the
A cam roller 24 bears on the periphery of the 55 trailing edges of the lands are to be ground as‘
control cam It at a point substantially tangen
compared with‘ the forward edges thereof topm
tial to- an are having its center originating at
vide the desired clearance angle. Figs. 5 and 6'
the rockable shaft 8. The cam roller is mounted
show the clearance angle of the lands 4| and
at the upper endof a rigid post 25 which ex
the corresponding shaping of the cam 43 with
tends along the side of the headstock arm [4 and"
some exaggeration for clarity of illustration. Inv
is secured at its lower end to the base frame 2
Fig. 5, the parts are shown just before one of vthe
so that the roller 24 occupies a ?xed position with
lands 4| engages the grind wheel, and just be
fore the cam' portion 44 engages the roller 24.
respect‘to the base structure 2. A horizontal
stem 26 is pivotally connected at 2'! to the head-. 15 At a position just beyond that of Fig. ,5, the
leading portion of the land 4| engages the grind
stock arm I4 and extends outwardly therefrom‘
wheel, and the cam portion 44 reaches the roller
through an opening in the post. The extended
24. As the portion 44 of the cam then moves
end of the stem is provided with a head and be-‘
across the roller 24, the entire working assem
’ tween the head and post 25 is a heavy spring 28‘
which, acting against the post 25, draws the en
tire headstock assembly‘ comprisinghe'adstocki
arms I3 and I4 and headstock 'spindleel2'towa'rdi
the post and causes the’p‘eriphery of the semis;
to bear against the roller: 24. h
a consequence;
the headstockspindle and'the workpiece W, ear-‘L 75
bly including headstock spindle l2, arms [3 and.
> M, and ‘the workpiece moves gradually towards '_
the grind wheel, thus grinding the land_4| ‘with
the clearance angler desired." Fig.6 shows the.
parts with the trailing edge portions or heels *
of the land being ground, and just about to sepa-;
2,406, 134:
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rate from the grind wheel. The portions 45 of
the cam between portions 44 merely connect the
latter and serve to return the workpiece to the
proper position for the beginning engagement of
the next land with the wheel G.
3. Grinding a tapered surface.-+A tapered sur
designed so that the Whole may constitute a com
plete machine entity, as distinguished from an
accessory or attachment.
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While I have now described a preferred spe
face is ground in the manner of the ?rst or sec
ci?c illustrative embodiment of the invention, it is
to be understood that the invention is not limited
to the exact illustrative machine as shown and
ond mode of operation described above with the
speci?cally described, but that various changes in
exception that the base plate 2. is set horizontally
design, structure and arrangement may be made
at an angle. This may be at a slant in either one 10
, without departing from the spirit of the present
direction or the other so that the workpiece may,
invention or the scope of the appended claim.
diverge or converge toward its extremity. Thus,
I‘claim:
,
the end of a tap may be ground with a taper
A grinding machine, comprising a headstock
towards its extremity; whereas, an end mill or
base structure pivotally mounted near one of its
router may be ground so that it diverges towards 15 ends about a vertical axis, means for releasably
its extremity. In such a mode of operation, the
tailstock is not employed. If the workpiece is
relatively long, however, it may be desired to sup
port it by the tailstock. In this type of operation
securing said base structure in its angularly ad
justed positions about its pivotal axis, a rockable
shaft carried by said base structure and projected
whole to the necessary angle relative to the grind
ing wheel on the previously-mentioned vertical
whereby to be swung laterally of the axis of said
rockable shaft upon a forced rocking movement
of said shaft, a rotatable spindle iournaled on said
headstock unit with its axis parallel to the axis
at one end over said pivoted base structure end,
the base plate 2 is placed on a centered position 20 a headstock unit swingably secured to said rock
on the work bed I, and the latteris pivoted as a
able shaft above said headstock base structure
pivot 3 with which the work beds of‘ grinding ma~ .
chines are conventionally provided.
4. Grinding internal surfaces-For such oper
ations, the grinding machine may be set up as for
any of the operations 1, 2 or 3 described above.
In place of the grinding wheel G, an internal
of said rockable shaft, a control cam carried by
and rotated with said spindle, a roller abutment
positioned peripherally opposite said control cam
and ?xed stationarily with respect to the head
stock base structure, spring means interposed be
tween said roller abutment and said headstock
unit for maintaining the control cam forcibly but
grinding wheel or spindle I, represented diagram
matically in Fig. 7 is employed. The internal
grinding wheel or spindle is, of course, small in
diameter to ?t Within the socket or bore to be
ground and is supported by any suitable conven_
yieldably in engagement with said roller abut
ment whereby said headstock unit is caused to
tional means, not shown. In Fig. '7, for purposes
of illustration, a control cam I6 having a special
surface 5| is shown shaped to cause the grinding
of a square opening 52 in a workpiece W.
swing in accordance with the peripheral con?gu
‘ ration of said control cam, means on said head
Other
internal shapes may be as readily ground by
proper shape of the control cam.
By reason of the fact that the control cam It‘
is mounted coaxially with respect to the Work
piece and is adjacent thereto and rotates there
with, it is a simple matter to adjust the phase
relation 0r angular position of the workpiece with 45
respect to the control cam.
As indicated in the foregoing description, the
Work bed proper and grinding Wheel G themselves
together with their directly associated elements
may be conventional, in which case my frame
structure 2 and its associated parts are, in eifect,
an attachment.
However, it is of course obvious
that the work bed and grinding wheel together
with their associated elements may be specially
stock spindle for supporting and rotating a work
piece about the axis of said spindle, a grinding
element cooperatively positioned and arranged
and adapted for peripheral grinding engagement
with the workpiece as supported on the spindle
of said headstock unit in whatever angular posi
tion the headstock base structure may be adjust
ed about its pivotal axis, a laterally swingable
tailstock unit, said tailstock unit being mounted
on a rockable shaft supported and arranged as a
continuation of the ?rst-mentioned rockable
shaft and normally in axial alignment therewith,
and a universal coupling between said ?rst-men
tioned and said last-mentioned rockable shafts,
said coupling having its center in alignment with
the pivotal axis of the headstock base structure.
JOSEPH A. CAMERON.
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